linux-kernel - [PATCH 5.10] vfio/pci: fix potential memory leak in vfio_intx

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Message-ID: <20250121074205.4836-1-arefev@swemel.ru>
Date: Tue, 21 Jan 2025 10:42:03 +0300
From: Denis Arefev <arefev@...mel.ru>
To: stable@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Alex Williamson <alex.williamson@...hat.com>,
	Cornelia Huck <cohuck@...hat.com>,
	Kevin Tian <kevin.tian@...el.com>,
	Eric Auger <eric.auger@...hat.com>,
	Reinette Chatre <reinette.chatre@...el.com>,
	Ye Bin <yebin10@...wei.com>,
	kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	lvc-project@...uxtesting.org
Subject: [PATCH 5.10] vfio/pci: fix potential memory leak in vfio_intx_enable()

From: Ye Bin <yebin10@...wei.com>

commit 82b951e6fbd31d85ae7f4feb5f00ddd4c5d256e2 upstream. 

If vfio_irq_ctx_alloc() failed will lead to 'name' memory leak.

Fixes: 18c198c96a81 ("vfio/pci: Create persistent INTx handler")
Signed-off-by: Ye Bin <yebin10@...wei.com>
Reviewed-by: Kevin Tian <kevin.tian@...el.com>
Acked-by: Reinette Chatre <reinette.chatre@...el.com>
Link: https://lore.kernel.org/r/20240415015029.3699844-1-yebin10@huawei.com
Signed-off-by: Alex Williamson <alex.williamson@...hat.com>
[Denis: minor fix to resolve merge conflict.]                                           
Signed-off-by: Denis Arefev <arefev@...mel.ru>                                    
---
Backport fix for CVE-2024-38632          
Link: https://nvd.nist.gov/vuln/detail/CVE-2024-38632
---
 drivers/vfio/pci/vfio_pci_intrs.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/vfio/pci/vfio_pci_intrs.c b/drivers/vfio/pci/vfio_pci_intrs.c
index 5b0b7fab3ba1..83498ec1ec0b 100644
--- a/drivers/vfio/pci/vfio_pci_intrs.c
+++ b/drivers/vfio/pci/vfio_pci_intrs.c
@@ -181,8 +181,10 @@ static int vfio_intx_enable(struct vfio_pci_device *vdev,
 		return -ENOMEM;
 
 	vdev->ctx = kzalloc(sizeof(struct vfio_pci_irq_ctx), GFP_KERNEL);
-	if (!vdev->ctx)
+	if (!vdev->ctx) {
+		kfree(name);
 		return -ENOMEM;
+	}
 
 	vdev->num_ctx = 1;
 
-- 
2.43.0